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The design of molecular functional materials with multi-step magnetic transitions has attracted considerable attention. However, the development of such materials is still infrequent and challenging. Here, a cyano-bridged square Prussian blue complex that exhibits a thermally induced four-step electron transfer coupled spin transition (ETCST) is reported. The magnetic and spectroscopic analyses confirm this multi-step transition. Variable-temperature infrared spectrum suggested the electronic structures in each phase and a four-step transition model is proposed. [ABSTRACT FROM AUTHOR]

As a remote and non‐contact stimulus, light offers the potential for manipulating the polarization of ferroelectric materials without physical contact. However, in current research, the non‐contact write‐read (erase) process lacks direct observation through the stable current as output signal. To address this limitation, we investigated the photoinduced polarization switching capabilities of the cyanide‐bridged compound [Fe2Co] using visible light, leading to the achievement of rewritable polarization. By subjecting [Fe2Co] crystals to alternating irradiation with 785 nm and 532 nm light, the polarization changes exhibited a distinct square wave pattern, confirming the reliability of the writing and erasing processes. Initialization involved exposing specific crystal units to 532 nm light for storing "1" or "0" information, while reading was accomplished by scanning the units with 785 nm light, resulting in brief current pulses for "1" states and no current signal for "0" states. This research unveils new possibilities for optical storage systems, paving the way for efficient and rewritable data storage and retrieval technologies, such as the next‐generation memories. [ABSTRACT FROM AUTHOR]

Light-induced polarization switchable molecular materials have attracted attention for decades owing to their potential remote manipulation and ultrafast responsiveness. Here we report a valence tautomeric (VT) complex with an enantiopure chiral ligand. By a suitable choice of counter anions, a significant improvement in photoconversion has been demonstrated, leading to novel photo-responsive polarization switching materials. [ABSTRACT FROM AUTHOR]

C19H18N2O2, triclinic, P... (no. 2), a=9.832(2) Å, b=10.590(2) Å, c=17.794(3) Å, α=77.080(3)°, β=81.720(4)°, γ=64.958(3)°, V=1633.7(5) ų, Z=4, Rgt(F)=0.0634, wRref(F²)=0.1964, T=296 K. [ABSTRACT FROM AUTHOR]

C25H19N5O3S, monoclinic, P21/c (no. 14), a=16.715(2) Å, b=11.2677(15) Å, c=12.6490(17) Å, β=110.818(2)°, V=2226.7(5) ų, Z=4, Rgt(F)=0.0424, wRref(F²)=0.1037, T=296 K. [ABSTRACT FROM AUTHOR]

C19H18N2O2, triclinic, P... (no. 2), a=9.832(2) Å, b=10.590(2) Å, c=17.794(3) Å, α=77.080(3)°, β=81.720(4)°, γ=64.958(3)°, V=1633.7(5) ų, Z=4, Rgt(F)=0.0634, wRref(F²)=0.1964, T=296 K. [ABSTRACT FROM AUTHOR]

The design of molecular functional materials with multi-step magnetic transitions has attracted considerable attention. However, the development of such materials is still infrequent and challenging. Here, a cyano-bridged square Prussian blue complex that exhibits a thermally induced four-step electron transfer coupled spin transition (ETCST) is reported. The magnetic and spectroscopic analyses confirm this multi-step transition. Variable-temperature infrared spectrum suggested the electronic structures in each phase and a four-step transition model is proposed.